In Object orientation §

See primary documentation in context for Submethods.

Submethods are public methods that will not be inherited by subclasses. The name stems from the fact that they are semantically similar to subroutines.

Submethods are useful for object construction and destruction tasks, as well as for tasks that are so specific to a certain type that subtypes would certainly have to override them.

For example, the default method new calls submethod BUILD on each class in an inheritance chain:

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class Point2D {
    has $.x;
    has $.y;

    submethod BUILD(:$!x, :$!y) {
        say "Initializing Point2D";
    }
}

class InvertiblePoint2D is Point2D {
    submethod BUILD() {
        say "Initializing InvertiblePoint2D";
    }
    method invert {
        self.new(x => - $.x, y => - $.y);
    }
}

say InvertiblePoint2D.new(x => 1, y => 2);
# OUTPUT: «Initializing Point2D␤»
# OUTPUT: «Initializing InvertiblePoint2D␤»
# OUTPUT: «InvertiblePoint2D.new(x => 1, y => 2)␤»

In Object orientation§

In Object orientation §